Lenovo ThinkPad L410 Hardware Maintenance Manual page 79

Removal steps of SIM slot cover
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Note: Loosen the screw .
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2
Some models in this product might have a SIM card that the customer has been installed.
If the computer you are servicing has a SIM card, remove it before you start the servicing.
After you finish the servicing, make sure that you insert the card back into the slot firmly.
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Chapter 8 Removing and replacing a FRU